Model-based Decoupling Control of a Magnet Engine Valve Actuator

Gaeta, Alessandro di; Giglio, Veniero; Police, Giuseppe

doi:10.4271/2009-01-2751

Cited by 11 publications

(13 citation statements)

References 8 publications

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“…19c. From (18), the frequency of the oscillations is found requiring that Im(G(j , k i )) = 0, leading to w = w n = √ k m , while the amplitude of the oscillations can be computed looking for the pair a and k i such that:…”

Section: Describing Function Analysismentioning

confidence: 99%

“…A ferromagnetic armature, directly connected to the engine valve by a non-ferromagnetic thin stem, is placed between the two magnets. The controller to accomplish the above task has been termed the first catching controller (FCC), or key-on controller [2,[17][18][19][20], due to the fact that the engine valve is caught the first time at engine key-on. The main role of the springs is to store potential energy when the valve is at one of two end strokes, while the electromagnets have to provide enough energy to compensate energy losses due to internal and external disturbance forces (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The main role of the springs is to store potential energy when the valve is at one of two end strokes, while the electromagnets have to provide enough energy to compensate energy losses due to internal and external disturbance forces (i.e. In fact, as shown in [2,18] high electrical power was necessary to take the engine valve from its initial position to its closing position ( Fig. Thus, when the EMVA is at work, one of the electromagnets holds the valve in one of the two extremal positions (see Fig.…”

Section: Introductionmentioning

confidence: 99%

“…at middle position, the magnetic force is 35 Newtons for a coil current of 18 A. Consequently, before starting the engine, a first controlled manoeuvre of the valve must be implemented in order to store energy in the springs, while leading the valve from the middle position to one of the two extremal positions. The controller to accomplish the above task has been termed the first catching controller (FCC), or key-on controller [2,[17][18][19][20], due to the fact that the engine valve is caught the first time at engine key-on. The first catching manoeuvre is quite arduous due to high spring stiffness and nonlinear magnetic force [14], i.e.…”

Section: Introductionmentioning

confidence: 99%

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Valve Position‐based Control at Engine Key‐on of an Electro‐mechanical Valve Actuator for Camless Engines: A Robust Controller Tuning Via Bifurcation Analysis

Velasco¹,

Gaeta²

2015

Asian Journal of Control

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Electro-mechanical valve actuators (EMVA) formed by two opposed electromagnets and two balanced springs are appealing solutions to implement advanced combustion concepts for camless engines. A crucial control problem for this valve actuator regards the first valve lift manoeuvre (termed 'first catching') to be rapidly performed after each insertion of the engine ignition key, when the EMVA rests at middle position where electromagnets offer low control authority. The control problem is challenging due to system nonlinear behavior. Mathematically, the EMVA system can be assumed to be a spring-mass impacting system affected by a non-smooth friction force and a dynamic saturated magnetic force. In this work an effective valve position-based first catching control strategy is proposed to control the strongly nonlinear system. Bifurcation analysis and parameter space simulations are used to study the closed-loop system behavior and to tune the controller gains as well. The effectiveness of the control approach is validated through numerical simulations of a highly predictive dynamic model of the valve actuator developed by authors in a previous work.

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Section: Describing Function Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Valve Position‐based Control at Engine Key‐on of an Electro‐mechanical Valve Actuator for Camless Engines: A Robust Controller Tuning Via Bifurcation Analysis

Velasco¹,

Gaeta²

2015

Asian Journal of Control

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“…One of the most common solutions is an independent valve actuator system able to realize Variable Valve Actuation (VVA) operations. To this aim, a promising solution relies on Electromechanical Valve Actuators (EMVA) technology, where an electronic control system commands each valve properly at every engine speed [2]. The effectiveness of the EMVA system depends on the performances of the control strategies necessary to guarantee precise valve closing/opening.…”

Section: Introductionmentioning

confidence: 99%

Model based control strategies for a class of nonlinear mechanical sub-systems

Ionescu¹,

Keyser²

2016

2016 IEEE International Conference on Automation, Quality and Testing, Robotics (AQTR)

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Abstract-This paper presents a comparison between various control strategies for a class of mechanical actuators common in heavy-duty industry. Typical actuator components are hydraulic or pneumatic elements with static non-linearities, which are commonly referred to as Hammerstein systems. Such static non-linearities may vary in time as a function of the load and hence classical inverse-model based control strategies may deliver sub-optimal performance. This paper investigates the ability of advanced model based control strategies to satisfy a tolerance interval for position error values, overshoot and settling time specifications. Due to the presence of static non-linearity requiring changing direction of movement, control effort is also evaluated in terms of zero crossing frequency (up-down or leftright movement). Simulation and experimental data from a lab setup suggest that sliding mode control is able to improve global performance parameters.

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Cycle‐by‐Cycle Adaptive Force Compensation for the Soft‐Landing Control of an Electro‐Mechanical Engine Valve Actuator

Gaeta¹,

Velasco²,

Montanaro³

2014

Asian Journal of Control

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Electro-mechanical valve actuators (EMVA) are a solution for implementing variable valve actuation in internal combustion engines. Their use can increase engine power, reduce fuel consumption and pollutant emissions, while significantly improving engine efficiency. The control of this actuator is a complex task since non-smooth nonlinearities, parameter variations and external forces strongly affect plant dynamics. In addition, the impact of the valve at its end-strokes translates into mechanical wear and unacceptable noise, and in the worst case the electromagnet may also fail to catch the valve, causing system failure. The design of effective control strategies to ensure valve capture with low impact velocities is therefore essential for the correct functioning of such a mechatronic device. In this paper, the control problem of reducing the impact velocity at "landing" known in the literature as soft landing control, is tackled via novel cycle-by-cycle adaptive force compensation control algorithms. Two schemes are presented: a discrete adaptive proportional integral controller to regulate landing velocity to a preassigned set-point, and a gradient descent method based controller to automatically achieve the minimum admissible impact velocity. The effectiveness of both methods in limiting landing velocities is shown numerically using a high predictive simulator of the EMVA system, when considering unknown varying environmental conditions, such as internal friction and external gas pressure forces.

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Model-based Decoupling Control of a Magnet Engine Valve Actuator

Cited by 11 publications

References 8 publications

Valve Position‐based Control at Engine Key‐on of an Electro‐mechanical Valve Actuator for Camless Engines: A Robust Controller Tuning Via Bifurcation Analysis

Valve Position‐based Control at Engine Key‐on of an Electro‐mechanical Valve Actuator for Camless Engines: A Robust Controller Tuning Via Bifurcation Analysis

Model based control strategies for a class of nonlinear mechanical sub-systems

Cycle‐by‐Cycle Adaptive Force Compensation for the Soft‐Landing Control of an Electro‐Mechanical Engine Valve Actuator

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